The HOBOnet Wireless Soil Moisture Sensor integrates the field-proven ECH2O™ 10HS Sensor and provides readings directly in volumetric water content. The 10cm probes measure soil moisture over a larger volume of soil, helping to average out any soil variability. The sensor's high-frequency design minimizes sensitivity to salinity and textural effects, and gives it a wide measurement range. HOBOnet Wireless Sensors communicate data directly to the RX3000 weather station or pass data through other wireless sensors back to the central station. They are preconfigured and ready to deploy, and data is accessed through HOBOlink, Onset’s innovative cloud-based software platform.
Sensor Features
±3% accuracy in typical soil conditions, and ±2% accuracy with soil-specific calibration
Measures a large 1-liter volume of soil, providing a more accurate picture of average soil moisture
High-frequency (70 MHz) circuit provides good accuracy even in high-salinity and sandy soils.
Wireless Features
868 MHz wireless mesh self-healing technology
450 to 600 meter (1,500 to 2,000 feet) wireless range and up to five hops
Up to 50 wireless sensors per RX3000
Simple button-push to join the HOBOnet wireless network
Onboard memory to ensure no data loss
Powered by rechargeable AA batteries and built-in solar panel
Measurement Range
In soil: 0 to 0.570 m³/m³ (volumetric water content)
Extended Range
-0.659 to 0.6026 m³/m³; see Note 1
Accuracy
±0.033 m³/m³ (±3.3%) typical 0 to 50°C (32° to 122°F) for mineral soils up to 10 dS/m and ±0.020 m³/m³ (±2%) with soil specific calibration; see Notes 4 and 5
Resolution
0.0008 m³/m³ (0.08%)
Volume of Influence
1 liter (33.81 oz)
Sensor Frequency
70 MHz
Sensor Operating Temperature Range
0° to 50°C (32° to 122°F). Although the sensor probe and cable can safely operate at below-freezing temperatures (to -40°C/F), the soil moisture data collected at these extreme temperatures is outside of the sensor’s accurate measurement range. Extended temperatures above 50°C (122°F) will decrease mote battery life.
Operating Temperature Range
-25° to 60°C (-13° to 140°F) with rechargeable batteries
-40 to 70°C (-40 to 158°F) with lithium batteries
Radio Power
12.6 mW (+11 dBm) non-adjustable
Transmission Range
Reliable connection to 457.2 m (1,500 ft) line of sight at 1.8 m (6 ft) high
Reliable connection to 609.6 m (2,000 ft) line of sight at 3 m (10 ft) high
Wireless Data Standard
IEEE 802.15.4
Radio Operating Frequencies
RXW-SMD-900: 904–924 MHz
RXW-SMD-868: 866.5 MHz
RXW-SMD-922: 916–924 MHz
Modulation Employed
OQPSK (Offset Quadrature Phase Shift Keying)
Data Rate
Up to 250 kbps, non-adjustable
Duty Cycle
<1%
Maximum Number of Motes
50 motes per one RX Wireless Sensor Network
Battery Type/ Power Source
Two AA 1.2V rechargeable NiMH batteries, powered by built-in solar panel or two AA 1.5 V lithium batteries for operating conditions of -40 to 70°C (-40 to 158°F)
Battery Life
With NiMH batteries: Typical 3–5 years when operated in the temperature range -20° to 40°C (-4°F to 104°F) and positioned toward the sun (see Deployment and Mounting), operation outside this range will reduce the battery service life With lithium batteries: 1 year, typical use
Memory
16 MB
Dimensions
RXW-SMD-xxx soil probe: 89 x 15 x 1.5 mm (3.5 x 0.62 x 0.06 in.)
Cable length: 5 m (16.4 ft)
Mote: 16.2 x 8.59 x 4.14 cm (6.38 x 3.38 x 1.63 inches)
Weight
RXW-SMD-xxx sensor and cable: 180 grams (6.3 oz)
Mote: 223 g (7.87 oz)
Materials
Sensor: Weatherproof Mote: PCPBT, silicone rubber seal
Environmental Rating
Mote: IP67, NEMA 6
Compliance Marks
RXW-SMD-900
RXW-SMD-868
RXW-SMD-922
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